High-Frequency Acoustic Scattering and Absorption Effects within Ship Wakes

Abstract

Clouds of small air-bubbles injected and mixed into the near-surface ocean within vessel wakes can create significant acoustic scattering and extinction. Recent high frequency (100 kHz) sidescan sonar measurements on a moving vessel showed persistent strong backscatter features and significant dropouts in sea-surface reverberation behind the wakes. Details of the sonar measurements and features of ship wakes recorded during these sonar trials are reviewed. Estimates of typical wake width, persistence, backscatter strength, and effective extinction are presented for the case of straight-running and turning vessels at speeds up to 20 knots.

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Document Details

Document Type
Technical Report
Publication Date
Aug 22, 2005
Accession Number
AD1005153

Entities

People

  • M. Trevorrow

Tags

DTIC Thesaurus Topics

  • Acoustic Absorption
  • Acoustic Scattering
  • Backscattering
  • Boundary Layer
  • Calibration
  • Collision Avoidance
  • Frequency
  • Geometry
  • Intensity
  • Measurement
  • Repetition Rate
  • Reverberation
  • Scattering
  • Side Looking Sonar
  • Sonar
  • Target Strength
  • Transmission Loss

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Atmospheric Remote Sensing.
  • Marine Hydrodynamics